Question 1 of 20 1.0/ 1.0 Points A manufacturer of flashlight batteries took a sample of 13 batteries from a days production and used them continuously until they failed to work. The life lengths of the batteries, in hours, until they failed were: 342, 426, 317, 545, 264, 451, 1049, 631, 512, 266, 492, 562, and 298. At the .05 level of significance, is there evidence to suggest that the mean life length of the batteries produced by this manufacturer is more than 400 hours? A.No, because the p-value for this test is equal to .1164 B.Yes, because the test value 1.257 is less than the critical value 1.782 C.Yes, because the test value 1.257 is less than the critical value 2.179 D.No, because the test value 1.257 is greater than the critical value 1.115 Answer Key: Question 2 of 20 1.0/ 1.0 Points You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample size larger than 25? A.The p value stays the same B.The p value may increase or decrease C.The p value increases D.The p value decreases Answer Key: Question 3 of 20 1.0/ 1.0 Points Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance. State the null and alternative hypotheses. A.H0: m = .79, H1: m > .79 B.H0: p ? .79, H1: p > .79 C.H0: p = .79, H1: p ? .79 D. H0: = .79, H1: > .79 Answer Key: Question 4 of 20 1.0/ 1.0 Points Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance. Compute the z or t value of the sample test statistic. A.t = 1.645 B.z = 0.62 C.z = 1.96 D.z = 0.69 Answer Key: Question 5 of 20 1.0/ 1.0 Points A severe storm has an average peak wave height of 16.4 feet for waves hitting the shore. Suppose that a storm is in progress with a severe storm class rating. Let us say that we want to set up a statistical test to see if the wave action (i.e., height) is dying down or getting worse. If you wanted to test the hypothesis that the waves are dying down, what would you use for the alternate hypothesis? Is the P-value area on the left, right, or on both sides of the mean? A.H1: is greater than 16.4 feet; the P-value area is on the left of the mean B.H1: is greater than 16.4 feet; the P-value area is on both sides of the mean C.H1: is less than 16.4 feet; the P-value area is on the left of the mean D.H1: is not equal to 16.4 feet; the P-value area is on the right of the mean Answer Key: Question 6 of 20 1.0/ 1.0 Points Which of the following statements are true of the null and alternative hypotheses? A.It is possible for neither hypothesis to be true B.Both hypotheses must be true C.Exactly one hypothesis must be true D.It is possible for both hypotheses to be true Answer Key: Question 7 of 20 1.0/ 1.0 Points The alternative hypothesis is also known as the: A.optional hypothesis B.elective hypothesis C.research hypothesis D.null hypothesis Answer Key: Question 8 of 20 1.0/ 1.0 Points Which of the following values is not typically used for ? A.0.01 B.0.50 C.0.10 D.0.05 Answer Key: Question 9 of 20 1.0/ 1.0 Points Smaller p-values indicate more evidence in support of the: A.the reduction of variance B.null hypothesis C.alternative hypothesis D.quality of the researcher Answer Key: Question 10 of 20 1.0/ 1.0 Points A lab technician…
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